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我们传统的前端更多的是用javascript实现各种复杂动画，自从有了Css3 transition和animation以来,前端开发在动画这一块有了更高的自由度和格局,对动画的开发也越来越容易。这篇文章就让我们汇总一下使用Css3实现的各种特效。这篇文章参考《css揭秘》这本书，并作出了自己的总结，希望能让大家更有收获，也强烈推荐大家看看这本书，你值得拥有。

我们将学到Css3outlineradial-gradientlinear-gradientbox-shadow程序员必读

Css3编码技巧

1.实现内部虚线边框

知识点：outline

核心代码

.dash-border{  width: 200px;  height: 100px;  line-height: 100px;  outline: 1px dashed #fff;  outline-offset: -10px;}

2.边框内圆角的实现

知识点：box-shadow

核心代码

.radius-border{  margin-top: 20px;  width: 180px;  height: 80px;  box-shadow: 0 0 0 10px gray;}

3.实现条纹背景与进度条

知识点：linear-gradient,repeating-linear-gradient

核心代码

/* 上 */background: linear-gradient(to right,#fb3 50%,#58a 0);background-size: 40px 100%;box-shadow: inset 0 0 3px #555;/* 中 */background: linear-gradient(45deg,#fb3 25%,#58a 0,#58a 50%,#fb3 0,#fb3 75%,#58a 0);background-size: 40px 40px;/* 下 (可以实现任意角度的渐变，45°时显示效果最好) */background: repeating-linear-gradient(60deg,#fb3,#fb3 15px,#58a 0,#58a 30px);

4.复杂的背景图案

知识点：linear-gradient,repeating-linear-gradient,radial-gradient

由于第二个图会有复杂的随机动画，建议大家可以亲自尝试看看效果，核心代码

<style>.bg-grid{  margin-top: 20px;  width: 200px;  height: 200px;  background-image: linear-gradient(rgba(255,255,255,1) 2px,transparent 0),  linear-gradient(to right,rgba(255,255,255,1) 2px,transparent 0),  linear-gradient(rgba(255,255,255,.2) 1px,transparent 0),  linear-gradient(to right,rgba(255,255,255,.2) 1px,transparent 0);  background-position: -50px -50px;  background-size: 100px 100px,100px 100px, 100% 10px, 10px 100%;}.animate-grid{  animation: move-grid 6s linear infinite;}@keyframes move-grid{  0%{    background-position: -50px -50px;  }  30%{    background-position: -100px -100px;  }  60%{    background-position: -100px -150px;  }  100%{    background-position: -50px -50px;  }}</style><div class="bg-grid black-theme"></div><div class="bg-grid black-theme animate-grid"></div>

红绿灯以及红路灯随机运动动画

利用css3多背景和position实现红绿灯和背景色块移动

核心代码

<style>.bg-dot{  margin-top: 20px;  width: 200px;  height: 50px;  background-image: radial-gradient(circle,#0cf 15px,transparent),                    radial-gradient(circle,red 15px,transparent),                    radial-gradient(circle,yellow 15px,transparent),                    radial-gradient(circle,green 15px,transparent);  background-repeat: no-repeat;  background-position: 0 0, 50px 0, 100px 0, 150px 0, 200px 0;  background-size: 50px 50px;}.animate-dot{  animation: move-dot 8s linear infinite;}.animate-dot2{  animation: move-dot2 6s linear infinite;}@keyframes move-dot{  0%{    background-position: 0 0, 50px 0, 100px 0, 150px 0;  }  30%{    background-position: 50px 0, 0 0, 100px 0, 150px 0;  }  60%{    background-position: 50px 0, 100px 0, 0 0, 150px 0;  }  100%{    background-position: 50px 0, 100px 0, 150px 0, 0 0;  }}@keyframes move-dot2{  0%{    background-image: radial-gradient(circle,#0cf 15px,transparent),                    radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,gray 15px,transparent);  }  30%{    background-image: radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,red 15px,transparent),                    radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,gray 15px,transparent);  }  60%{    background-image: radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,yellow 15px,transparent),                    radial-gradient(circle,gray 15px,transparent);  }  100%{    background-image: radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,gray 15px,transparent),                    radial-gradient(circle,green 15px,transparent);  }}</style><div class="bg-dot black-theme animate-dot"></div><div class="bg-dot black-theme animate-dot2"></div>

棋盘背景以及棋盘背景随机动画

利用背景渐变实现棋盘图案

核心代码

<style>.bg-qi{  margin-top: 20px;  width: 200px;  height: 200px;  background-color: #eee;  background-image: linear-gradient(45deg,rgba(0,0,0,.25) 25%,transparent 0,transparent 75%,rgba(0,0,0,.25) 0),  linear-gradient(45deg,rgba(0,0,0,.25) 25%,transparent 0,transparent 75%,rgba(0,0,0,.25) 0);  background-position: 0 0, 20px 20px;  background-size: 40px 40px;  box-shadow: 2px 2px 4px rgba(0,0,0,.4);}</style><div class="bg-qi black-theme"></div>

伪随机背景

利用背景渐变，keyframe动画，实现复杂的伪随机动画

核心代码

<style>.bg-line-rand{  margin-top: 20px;  width: 480px;  height: 60px;  background-color: #eee;  background-image: linear-gradient(90deg,#fb3 11px, transparent 0),                    linear-gradient(90deg,#ab4 23px, transparent 0),                    linear-gradient(90deg,#655 41px, transparent 0);  background-size: 41px 100%, 61px 100%, 83px 100%;  box-shadow: 2px 2px 4px rgba(0,0,0,.4);}.bg-dot-rand{  margin-top: 20px;  width: 200px;  height: 200px;  background-color: #eee;  background-image: radial-gradient(circle,#fb3 5px, transparent 0),                    radial-gradient(circle,#ab4 13px, transparent 0),                    radial-gradient(circle,#655 31px, transparent 0);  background-repeat: no-repeat;  background-size: 101px 203px, 147px 60px, 373px 201px;  box-shadow: 2px 2px 4px rgba(0,0,0,.4);}.animate1{  animation: move 4s linear infinite;}.animate2{  animation: move2 4s linear infinite;}@keyframes move{  0%{    background-position: 0 0, 0 0, 0 0;  }  50%{    background-position: -10px 0, 20px 0, 30px 0;  }  100%{    background-position: 0 0, 30px 0, 10px 0;  }}@keyframes move2{  0%{    background-position: 0 0, 0 0, 0 0;  }  50%{    background-position: -10px 30px, 20px 0, -40px 80px;  }  100%{    background-position: 0 20px, 60px -20px, 10px 30px;  }}</style><div class="bg-line-rand black-theme"></div><div class="bg-line-rand black-theme animate1"></div><div class="bg-dot-rand black-theme animate2"></div>

5.折角效果

知识点：linear-gradient

核心代码

<style>.fold{  margin-left: auto;  margin-right: auto;  margin-bottom: 20px;  width: 200px;  height: 80px;  color: #fff;  line-height: 80px;  text-align: center;  background: linear-gradient(to left bottom,transparent 50%,rgba(0,0,0,.5) 0) no-repeat 100% 0 / 2em 2em,              linear-gradient(-135deg,transparent 1.4em,#06c 0);}.linear{  background: linear-gradient(to left bottom,transparent 50%,rgba(0,0,0,.5)) no-repeat 100% 0 / 2em 2em,              linear-gradient(-135deg,transparent 1.4em,#06c);}</style><div class="fold">折角效果哦</div><div class="fold linear">折角效果哦</div>

2.内阴影圆折角效果

核心代码

<style>.fold-1{  margin-left: auto;  margin-right: auto;  margin-bottom: 20px;  position: relative;  width: 200px;  height: 80px;  border-radius: .5em;  color: #fff;  line-height: 80px;  text-align: center;  background: linear-gradient(-150deg,transparent 1.5em, #58a 0);}.fold-1::before{  content: "";  position: absolute;  top: 0;  right: 0;  background: linear-gradient(to left bottom,transparent 50%,rgba(0,0,0,.2) 0,rgba(0,0,0,.4)) 100% 0 no-repeat;  width: 1.73em;  height: 3em;  transform: translateY(-1.3em) rotate(-30deg);  transform-origin: bottom right;  border-bottom-left-radius: inherit;  box-shadow: -.2em .2em .3em -.1em rgba(0,0,0,.15);}</style><div class="fold-1">折角效果哦</div>

6.自适应文本的条纹背景

知识点：linear-gradient,line-height,background-origin

核心代码

<style>.stripe-bg{  padding: .5em;  line-height: 1.5em;  background: beige;  background-size: auto 3em;  background-origin: content-box;  background-image: linear-gradient(rgba(0,0,0,.2) 50%, transparent 0);}.stripe-bg > p{  margin: 0;}</style><div class="stripe-bg">  <p>hello you</p>  <p>hello you</p>  <p>hello you</p>  <p>hello you</p>  <p>hello you</p></div>

7.自定义的下划线实现

知识点linear-gridient

小伙伴们注意到了吗？默认的下划线会将文字穿过，而上面的不会呦！

核心代码

<style>.my-line{  line-height: 1.4em;  background: linear-gradient(gray,gray) no-repeat;  background-size: 100% 1px;  background-position: 0 1.15em;  text-shadow: .05em 0 #fff, -.05em 0 #fff;}</style><div class=""><span class="my-line">i have your big apple.you have a too? hi hi hi.</span></div>

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